PROPERTY, PLANT AND EQUIPMENT - Summary of Property Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 752,275	$ 724,509
Accumulated depreciation and amortization	(448,106)	(431,887)
Total	304,169	292,622
Land, building and building improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	163,567	164,486
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	546,663	520,110
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 42,045	$ 39,913